1. Peripheral Nervous System
(PNS)

2. PNS All the nerves outside the brain and spinal cord
Neurons are organized into bundles of axons (these are called nerves)
The PNS consists of 2 parts: SOMATIC and AUTONOMIC

3. SOMATIC
Sensory nerves that carry info from sense organs to the brain and spinal cord
Motor nerves that relay commands from brain and spinal cord to muscles
Perception, voluntary movement, reflexes

4. AUTONOMIC Regulates internal organs—heart, lungs, etc.
Emotions and stress reactions
The ANS is further divided into 2 parts:
SYMPATHETIC—”fight or flight” reactions
PARASYMPATHETIC—return to normal